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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b6dc0a8e8097e887deae49bd6cc2fe53fb75b8069e27eb49454068cb2d3e4a' 
  AND token = 'SuwoJaszQ4NO4TI4XhFlbb4rEzzzwnVRmMYZMZRQXhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}